hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestBlocksScheduledCounter.java - hadoop - Git at Google

 /**
  * Licensed to the Apache Software Foundation (ASF) under one
  * or more contributor license agreements.  See the NOTICE file
  * distributed with this work for additional information
  * regarding copyright ownership.  The ASF licenses this file
  * to you under the Apache License, Version 2.0 (the
  * "License"); you may not use this file except in compliance
  * with the License.  You may obtain a copy of the License at
  *
  *     http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
 package org.apache.hadoop.hdfs;

 import static org.junit.Assert.assertEquals;

 import java.io.IOException;
 import java.util.ArrayList;

 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.FSDataOutputStream;
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
 import org.apache.hadoop.hdfs.protocol.LocatedBlock;
 import org.apache.hadoop.hdfs.server.blockmanagement.BlockManager;
 import org.apache.hadoop.hdfs.server.blockmanagement.BlockManagerTestUtil;
 import org.apache.hadoop.hdfs.server.blockmanagement.DatanodeDescriptor;
 import org.apache.hadoop.hdfs.server.blockmanagement.DatanodeManager;
 import org.apache.hadoop.hdfs.server.datanode.DataNode;
 import org.apache.hadoop.hdfs.server.datanode.DataNodeTestUtils;
 import org.apache.hadoop.hdfs.server.namenode.NameNodeAdapter;
 import org.junit.After;
 import org.junit.Test;

 /**
  * This class tests DatanodeDescriptor.getBlocksScheduled() at the
  * NameNode. This counter is supposed to keep track of blocks currently
  * scheduled to a datanode.
  */
 public class TestBlocksScheduledCounter {
   MiniDFSCluster cluster = null;
   FileSystem fs = null;

   @After
   public void tearDown() throws IOException {
     if (fs != null) {
       fs.close();
       fs = null;
     }
     if(cluster!=null){
       cluster.shutdown();
       cluster = null;
     }
   }

   @Test
   public void testBlocksScheduledCounter() throws IOException {
     cluster = new MiniDFSCluster.Builder(new HdfsConfiguration()).build();

     cluster.waitActive();
     fs = cluster.getFileSystem();

     //open a file an write a few bytes:
     FSDataOutputStream out = fs.create(new Path("/testBlockScheduledCounter"));
     for (int i=0; i<1024; i++) {
       out.write(i);
     }
     // flush to make sure a block is allocated.
     out.hflush();

     ArrayList<DatanodeDescriptor> dnList = new ArrayList<DatanodeDescriptor>();
     final DatanodeManager dm = cluster.getNamesystem().getBlockManager(
         ).getDatanodeManager();
     dm.fetchDatanodes(dnList, dnList, false);
     DatanodeDescriptor dn = dnList.get(0);

     assertEquals(1, dn.getBlocksScheduled());

     // close the file and the counter should go to zero.
     out.close();
     assertEquals(0, dn.getBlocksScheduled());
   }

   /**
    * Abandon block should decrement the scheduledBlocks count for the dataNode.
    */
   @Test
   public void testScheduledBlocksCounterShouldDecrementOnAbandonBlock()
       throws Exception {
     cluster = new MiniDFSCluster.Builder(new HdfsConfiguration()).numDataNodes(
         2).build();

     cluster.waitActive();
     fs = cluster.getFileSystem();

     DatanodeManager datanodeManager = cluster.getNamesystem().getBlockManager()
         .getDatanodeManager();
     ArrayList<DatanodeDescriptor> dnList = new ArrayList<DatanodeDescriptor>();
     datanodeManager.fetchDatanodes(dnList, dnList, false);
     for (DatanodeDescriptor descriptor : dnList) {
       assertEquals("Blocks scheduled should be 0 for " + descriptor.getName(),
           0, descriptor.getBlocksScheduled());
     }

     cluster.getDataNodes().get(0).shutdown();
     // open a file an write a few bytes:
     FSDataOutputStream out = fs.create(new Path("/testBlockScheduledCounter"),
         (short) 2);
     for (int i = 0; i < 1024; i++) {
       out.write(i);
     }
     // flush to make sure a block is allocated.
     out.hflush();

     DatanodeDescriptor abandonedDn = datanodeManager.getDatanode(cluster
         .getDataNodes().get(0).getDatanodeId());
     assertEquals("for the abandoned dn scheduled counts should be 0", 0,
         abandonedDn.getBlocksScheduled());

     for (DatanodeDescriptor descriptor : dnList) {
       if (descriptor.equals(abandonedDn)) {
         continue;
       }
       assertEquals("Blocks scheduled should be 1 for " + descriptor.getName(),
           1, descriptor.getBlocksScheduled());
     }
     // close the file and the counter should go to zero.
     out.close();
     for (DatanodeDescriptor descriptor : dnList) {
       assertEquals("Blocks scheduled should be 0 for " + descriptor.getName(),
           0, descriptor.getBlocksScheduled());
     }
   }

   /**
    * Test if Block Scheduled counter decrement if scheduled blocks file is.
    * deleted
    * @throws Exception
    */
   @Test
   public void testScheduledBlocksCounterDecrementOnDeletedBlock()
       throws Exception {
     final Configuration conf = new HdfsConfiguration();
     conf.setLong(DFSConfigKeys.DFS_BLOCK_SIZE_KEY, 1024);
     conf.setLong(DFSConfigKeys.DFS_HEARTBEAT_INTERVAL_KEY, 1);
     conf.setInt(DFSConfigKeys.DFS_NAMENODE_REDUNDANCY_INTERVAL_SECONDS_KEY, 1);
     cluster = new MiniDFSCluster.Builder(conf).numDataNodes(5).build();
     cluster.waitActive();
     BlockManager bm = cluster.getNamesystem().getBlockManager();
     try {
       DistributedFileSystem dfs = cluster.getFileSystem();
       // 1. create a file
       Path filePath = new Path("/tmp.txt");
       DFSTestUtil.createFile(dfs, filePath, 1024, (short) 3, 0L);

       // 2. disable the heartbeats
       for (DataNode dn : cluster.getDataNodes()) {
         DataNodeTestUtils.setHeartbeatsDisabledForTests(dn, true);
       }

       DatanodeManager datanodeManager =
           cluster.getNamesystem().getBlockManager().getDatanodeManager();
       ArrayList<DatanodeDescriptor> dnList =
           new ArrayList<DatanodeDescriptor>();
       datanodeManager.fetchDatanodes(dnList, dnList, false);

       // 3. mark a couple of blocks as corrupt
       LocatedBlock block = NameNodeAdapter
           .getBlockLocations(cluster.getNameNode(), filePath.toString(), 0, 1)
           .get(0);
       DatanodeInfo[] locs = block.getLocations();
       cluster.getNamesystem().writeLock();
       try {
         bm.findAndMarkBlockAsCorrupt(block.getBlock(), locs[0], "STORAGE_ID",
             "TEST");
         bm.findAndMarkBlockAsCorrupt(block.getBlock(), locs[1], "STORAGE_ID",
             "TEST");
         BlockManagerTestUtil.computeAllPendingWork(bm);
         BlockManagerTestUtil.updateState(bm);
         assertEquals(1L, bm.getPendingReconstructionBlocksCount());
       } finally {
         cluster.getNamesystem().writeUnlock();
       }

       // 4. delete the file
       dfs.delete(filePath, true);
       int blocksScheduled = 0;
       for (DatanodeDescriptor descriptor : dnList) {
         if (descriptor.getBlocksScheduled() != 0) {
           blocksScheduled += descriptor.getBlocksScheduled();
         }
       }
       assertEquals(0, blocksScheduled);
     } finally {
       cluster.shutdown();
     }
   }

   /**
    * Test Block Scheduled counter on truncating a file.
    * @throws Exception
    */
   @Test
   public void testBlocksScheduledCounterOnTruncate() throws Exception {
     final Configuration conf = new HdfsConfiguration();
     conf.setInt(DFSConfigKeys.DFS_NAMENODE_REDUNDANCY_INTERVAL_SECONDS_KEY, 1);
     cluster = new MiniDFSCluster.Builder(conf).numDataNodes(3).build();
     cluster.waitActive();
     BlockManager bm = cluster.getNamesystem().getBlockManager();
     try {
       DistributedFileSystem dfs = cluster.getFileSystem();
       // 1. stop a datanode
       cluster.stopDataNode(0);

       // 2. create a file
       Path filePath = new Path("/tmp");
       DFSTestUtil.createFile(dfs, filePath, 1024, (short) 3, 0L);

       DatanodeManager datanodeManager =
           cluster.getNamesystem().getBlockManager().getDatanodeManager();
       ArrayList<DatanodeDescriptor> dnList =
           new ArrayList<DatanodeDescriptor>();
       datanodeManager.fetchDatanodes(dnList, dnList, false);

       // 3. restart the stopped datanode
       cluster.restartDataNode(0);

       // 4. disable the heartbeats
       for (DataNode dn : cluster.getDataNodes()) {
         DataNodeTestUtils.setHeartbeatsDisabledForTests(dn, true);
       }

       cluster.getNamesystem().writeLock();
       try {
         BlockManagerTestUtil.computeAllPendingWork(bm);
         BlockManagerTestUtil.updateState(bm);
         assertEquals(1L, bm.getPendingReconstructionBlocksCount());
       } finally {
         cluster.getNamesystem().writeUnlock();
       }

       // 5.truncate the file whose block exists in pending reconstruction
       dfs.truncate(filePath, 10);
       int blocksScheduled = 0;
       for (DatanodeDescriptor descriptor : dnList) {
         if (descriptor.getBlocksScheduled() != 0) {
           blocksScheduled += descriptor.getBlocksScheduled();
         }
       }
       assertEquals(0, blocksScheduled);
     } finally {
       cluster.shutdown();
     }
   }
 }
	/**
	* Licensed to the Apache Software Foundation (ASF) under one
	* or more contributor license agreements. See the NOTICE file
	* distributed with this work for additional information
	* regarding copyright ownership. The ASF licenses this file
	* to you under the Apache License, Version 2.0 (the
	* "License"); you may not use this file except in compliance
	* with the License. You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/
	package org.apache.hadoop.hdfs;

	import static org.junit.Assert.assertEquals;

	import java.io.IOException;
	import java.util.ArrayList;

	import org.apache.hadoop.conf.Configuration;
	import org.apache.hadoop.fs.FSDataOutputStream;
	import org.apache.hadoop.fs.FileSystem;
	import org.apache.hadoop.fs.Path;
	import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
	import org.apache.hadoop.hdfs.protocol.LocatedBlock;
	import org.apache.hadoop.hdfs.server.blockmanagement.BlockManager;
	import org.apache.hadoop.hdfs.server.blockmanagement.BlockManagerTestUtil;
	import org.apache.hadoop.hdfs.server.blockmanagement.DatanodeDescriptor;
	import org.apache.hadoop.hdfs.server.blockmanagement.DatanodeManager;
	import org.apache.hadoop.hdfs.server.datanode.DataNode;
	import org.apache.hadoop.hdfs.server.datanode.DataNodeTestUtils;
	import org.apache.hadoop.hdfs.server.namenode.NameNodeAdapter;
	import org.junit.After;
	import org.junit.Test;

	/**
	* This class tests DatanodeDescriptor.getBlocksScheduled() at the
	* NameNode. This counter is supposed to keep track of blocks currently
	* scheduled to a datanode.
	*/
	public class TestBlocksScheduledCounter {
	MiniDFSCluster cluster = null;
	FileSystem fs = null;

	@After
	public void tearDown() throws IOException {
	if (fs != null) {
	fs.close();
	fs = null;
	}
	if(cluster!=null){
	cluster.shutdown();
	cluster = null;
	}
	}

	@Test
	public void testBlocksScheduledCounter() throws IOException {
	cluster = new MiniDFSCluster.Builder(new HdfsConfiguration()).build();

	cluster.waitActive();
	fs = cluster.getFileSystem();

	//open a file an write a few bytes:
	FSDataOutputStream out = fs.create(new Path("/testBlockScheduledCounter"));
	for (int i=0; i<1024; i++) {
	out.write(i);
	}
	// flush to make sure a block is allocated.
	out.hflush();

	ArrayList<DatanodeDescriptor> dnList = new ArrayList<DatanodeDescriptor>();
	final DatanodeManager dm = cluster.getNamesystem().getBlockManager(
	).getDatanodeManager();
	dm.fetchDatanodes(dnList, dnList, false);
	DatanodeDescriptor dn = dnList.get(0);

	assertEquals(1, dn.getBlocksScheduled());

	// close the file and the counter should go to zero.
	out.close();
	assertEquals(0, dn.getBlocksScheduled());
	}

	/**
	* Abandon block should decrement the scheduledBlocks count for the dataNode.
	*/
	@Test
	public void testScheduledBlocksCounterShouldDecrementOnAbandonBlock()
	throws Exception {
	cluster = new MiniDFSCluster.Builder(new HdfsConfiguration()).numDataNodes(
	2).build();

	cluster.waitActive();
	fs = cluster.getFileSystem();

	DatanodeManager datanodeManager = cluster.getNamesystem().getBlockManager()
	.getDatanodeManager();
	ArrayList<DatanodeDescriptor> dnList = new ArrayList<DatanodeDescriptor>();
	datanodeManager.fetchDatanodes(dnList, dnList, false);
	for (DatanodeDescriptor descriptor : dnList) {
	assertEquals("Blocks scheduled should be 0 for " + descriptor.getName(),
	0, descriptor.getBlocksScheduled());
	}

	cluster.getDataNodes().get(0).shutdown();
	// open a file an write a few bytes:
	FSDataOutputStream out = fs.create(new Path("/testBlockScheduledCounter"),
	(short) 2);
	for (int i = 0; i < 1024; i++) {
	out.write(i);
	}
	// flush to make sure a block is allocated.
	out.hflush();

	DatanodeDescriptor abandonedDn = datanodeManager.getDatanode(cluster
	.getDataNodes().get(0).getDatanodeId());
	assertEquals("for the abandoned dn scheduled counts should be 0", 0,
	abandonedDn.getBlocksScheduled());

	for (DatanodeDescriptor descriptor : dnList) {
	if (descriptor.equals(abandonedDn)) {
	continue;
	}
	assertEquals("Blocks scheduled should be 1 for " + descriptor.getName(),
	1, descriptor.getBlocksScheduled());
	}
	// close the file and the counter should go to zero.
	out.close();
	for (DatanodeDescriptor descriptor : dnList) {
	assertEquals("Blocks scheduled should be 0 for " + descriptor.getName(),
	0, descriptor.getBlocksScheduled());
	}
	}

	/**
	* Test if Block Scheduled counter decrement if scheduled blocks file is.
	* deleted
	* @throws Exception
	*/
	@Test
	public void testScheduledBlocksCounterDecrementOnDeletedBlock()
	throws Exception {
	final Configuration conf = new HdfsConfiguration();
	conf.setLong(DFSConfigKeys.DFS_BLOCK_SIZE_KEY, 1024);
	conf.setLong(DFSConfigKeys.DFS_HEARTBEAT_INTERVAL_KEY, 1);
	conf.setInt(DFSConfigKeys.DFS_NAMENODE_REDUNDANCY_INTERVAL_SECONDS_KEY, 1);
	cluster = new MiniDFSCluster.Builder(conf).numDataNodes(5).build();
	cluster.waitActive();
	BlockManager bm = cluster.getNamesystem().getBlockManager();
	try {
	DistributedFileSystem dfs = cluster.getFileSystem();
	// 1. create a file
	Path filePath = new Path("/tmp.txt");
	DFSTestUtil.createFile(dfs, filePath, 1024, (short) 3, 0L);

	// 2. disable the heartbeats
	for (DataNode dn : cluster.getDataNodes()) {
	DataNodeTestUtils.setHeartbeatsDisabledForTests(dn, true);
	}

	DatanodeManager datanodeManager =
	cluster.getNamesystem().getBlockManager().getDatanodeManager();
	ArrayList<DatanodeDescriptor> dnList =
	new ArrayList<DatanodeDescriptor>();
	datanodeManager.fetchDatanodes(dnList, dnList, false);

	// 3. mark a couple of blocks as corrupt
	LocatedBlock block = NameNodeAdapter
	.getBlockLocations(cluster.getNameNode(), filePath.toString(), 0, 1)
	.get(0);
	DatanodeInfo[] locs = block.getLocations();
	cluster.getNamesystem().writeLock();
	try {
	bm.findAndMarkBlockAsCorrupt(block.getBlock(), locs[0], "STORAGE_ID",
	"TEST");
	bm.findAndMarkBlockAsCorrupt(block.getBlock(), locs[1], "STORAGE_ID",
	"TEST");
	BlockManagerTestUtil.computeAllPendingWork(bm);
	BlockManagerTestUtil.updateState(bm);
	assertEquals(1L, bm.getPendingReconstructionBlocksCount());
	} finally {
	cluster.getNamesystem().writeUnlock();
	}

	// 4. delete the file
	dfs.delete(filePath, true);
	int blocksScheduled = 0;
	for (DatanodeDescriptor descriptor : dnList) {
	if (descriptor.getBlocksScheduled() != 0) {
	blocksScheduled += descriptor.getBlocksScheduled();
	}
	}
	assertEquals(0, blocksScheduled);
	} finally {
	cluster.shutdown();
	}
	}

	/**
	* Test Block Scheduled counter on truncating a file.
	* @throws Exception
	*/
	@Test
	public void testBlocksScheduledCounterOnTruncate() throws Exception {
	final Configuration conf = new HdfsConfiguration();
	conf.setInt(DFSConfigKeys.DFS_NAMENODE_REDUNDANCY_INTERVAL_SECONDS_KEY, 1);
	cluster = new MiniDFSCluster.Builder(conf).numDataNodes(3).build();
	cluster.waitActive();
	BlockManager bm = cluster.getNamesystem().getBlockManager();
	try {
	DistributedFileSystem dfs = cluster.getFileSystem();
	// 1. stop a datanode
	cluster.stopDataNode(0);

	// 2. create a file
	Path filePath = new Path("/tmp");
	DFSTestUtil.createFile(dfs, filePath, 1024, (short) 3, 0L);

	DatanodeManager datanodeManager =
	cluster.getNamesystem().getBlockManager().getDatanodeManager();
	ArrayList<DatanodeDescriptor> dnList =
	new ArrayList<DatanodeDescriptor>();
	datanodeManager.fetchDatanodes(dnList, dnList, false);

	// 3. restart the stopped datanode
	cluster.restartDataNode(0);

	// 4. disable the heartbeats
	for (DataNode dn : cluster.getDataNodes()) {
	DataNodeTestUtils.setHeartbeatsDisabledForTests(dn, true);
	}

	cluster.getNamesystem().writeLock();
	try {
	BlockManagerTestUtil.computeAllPendingWork(bm);
	BlockManagerTestUtil.updateState(bm);
	assertEquals(1L, bm.getPendingReconstructionBlocksCount());
	} finally {
	cluster.getNamesystem().writeUnlock();
	}

	// 5.truncate the file whose block exists in pending reconstruction
	dfs.truncate(filePath, 10);
	int blocksScheduled = 0;
	for (DatanodeDescriptor descriptor : dnList) {
	if (descriptor.getBlocksScheduled() != 0) {
	blocksScheduled += descriptor.getBlocksScheduled();
	}
	}
	assertEquals(0, blocksScheduled);
	} finally {
	cluster.shutdown();
	}
	}
	}